Nicaragua
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Calm river reflecting clouds and riverside vegetation.

Nicaragua · Río San Juan

Río San
Juan.

El Castillo fortress, Solentiname and the southern reserves

See what to do (4)Destination map

Photo: Gustavo Rayo Prado

Before you go,
understand the place.

Río San Juan gathers the Fortress of the Immaculate Conception, in El Castillo, with the hours INTUR published in July 2026; the Solentiname archipelago, Los Guatuzos refuge and Indio Maíz Biological Reserve, where, according to the Río San Juan tourism portal, MARENA does not allow entry to most of the reserve. San Carlos is the gateway.

Best time to go
According to Canada, the rainy season runs from May to November, with October the wettest month, and the hurricane season from mid-May to the end of November on the Pacific and from early June to the end of November in the Atlantic and the Caribbean. It is an approximate national pattern, not a climate record for each region. Follow the civil protection authorities’ instructions.
Getting there
This guide does not calculate road routes or travel times and offers no arrival points. San Carlos, 290 km from Managua according to INTUR, is the gateway to the river; El Castillo is 55 km from San Carlos and has no cars: it is reached by river. The Río San Juan tourism portal (undated) lists daily buses from Managua to San Carlos and daily fast boats from San Carlos to El Castillo: confirm the times at the dock. The Granada–San Carlos boat across the lake was not confirmed: one guide reported it suspended in August 2023 because of low water, and another undated source says it pauses during the dry season.

One way to explore

Themed guides

Places grouped by theme, to plan your day.

  • 4 places

    Fortress, islands and reserves

    The Fortress of the Immaculate Conception, with the hours INTUR published in July 2026, and Solentiname, Los Guatuzos and Indio Maíz, with unconfirmed status.

    Open the full guide

The place, in context

Everything you can do

Closed or restricted places are included and flagged, so you know what to expect.

Showing 4 of 4 · 3 unconfirmed, flagged

Nature and jungle · 3

  • NatureStatus unconfirmed

    Indio Maíz Biological Reserve

    Between El Castillo, San Juan de Nicaragua and Bluefields, according to INTUR. The pin is the centre of the reserve in OpenStreetMap; it is not the entrance.53.7 km in a straight line from the regional map centre

    Entry
    Not stated
    Hours
    Not stated
    Booking
    Not confirmed

    A 316,720 ha reserve of tropical rainforest, lagoons, rivers and wetlands in the far south-east of the country, declared in 1991, according to INTUR. According to the press (2023), MARENA staff and the Army’s ecological battalion monitor the reserve through satellite tracking of hotspots.

    Status not confirmed: according to the undated Río San Juan tourism portal, MARENA does not allow entry to most of the reserve, and no MARENA rule or current visiting conditions were read; the reserve borders Costa Rica, and Canada reports more crime in border areas. Check before you go.

    Source: INTUR (Mapa Nacional de Turismo) – Reserva Biológica Indio Maíz (2021) · 2021 · +3

    Practical details and sources
    Booking
    According to the Río San Juan tourism portal, undated, MARENA does not allow entry to most of the reserve and there are only two areas where you can enter. No MARENA rule or permit was read.

    Sources: INTUR (Mapa Nacional de Turismo) – Reserva Biológica Indio Maíz (2021) · Río San Juan (portal de INTUR) – Indio Maíz Biological Reserve (sin fecha) · El 19 Digital – Guardianes de la Reserva Indio Maíz (16 may. 2023) · Gobierno de Canadá – Nicaragua travel advice (31 ago. 2026)

  • NatureStatus unconfirmed

    Solentiname Archipelago

    Lake Nicaragua; reached by boat from San Carlos, according to INTUR. The pin is the centre of the archipelago in OpenStreetMap; it is not the entrance.53.1 km in a straight line from the regional map centre

    Entry
    Not stated
    Hours
    Not stated
    Booking
    Not stated

    A 17,950 ha archipelago in Lake Nicaragua, with four large islands and many islets; on Mancarrón island (Macarrón, according to INTUR) artisans work balsa wood and primitivist painting, according to INTUR (2022).

    Status not confirmed: the INTUR page read dates from 2022 and gives no current status or services. Check before you go.

    Source: INTUR (Mapa Nacional de Turismo) – Archipiélago de Solentiname (2022) · 2022 · +1

    Practical details and sources

    Tip: The Río San Juan tourism portal, undated, lists boats from San Carlos to Solentiname on Tuesdays and Fridays, with an ambiguous departure time: confirm it at the dock.

    Sources: INTUR (Mapa Nacional de Turismo) – Archipiélago de Solentiname (2022) · Río San Juan (portal de INTUR) – Transporte (sin fecha)

  • NatureStatus unconfirmed

    Los Guatuzos Wildlife Refuge

    South shore of the lake, San Carlos municipality; the usual gateway community is Papaturro. The pin is the centre of the refuge in OpenStreetMap; it is not the entrance.54.1 km in a straight line from the regional map centre

    Entry
    Not stated
    Hours
    Not stated
    Booking
    Not stated

    A 437 km² refuge of forests and wetlands on the south shore of Lake Nicaragua, the country's first wetland declared a Ramsar site (No. 915, 1997), according to ViaNica, which warns there is little visitor infrastructure.

    Status not confirmed: the sources read are undated and no MARENA source on the refuge was read. Check before you go.

    Source: ViaNica – Refugio de Vida Silvestre Los Guatuzos (sin fecha) · 2026 · +1

    Practical details and sources

    Tip: Boats from San Carlos to Papaturro take about 3.5 hours (C$100 one way), according to ViaNica, undated; ViaNica and the Río San Juan tourism portal disagree on the departure days.

    Sources: ViaNica – Refugio de Vida Silvestre Los Guatuzos (sin fecha) · Río San Juan (portal de INTUR) – Transporte (sin fecha)

Living culture · 1

Río San Juan · Practical guide

The essentials

  1. The Fortress of the Immaculate Conception and its site museum, in El Castillo

Río San Juan · Practical guide

Practical tips

  1. In Indio Maíz, MARENA does not allow entry to most of the reserve and there are only two access areas, according to the Río San Juan tourism portal: do not go without confirming the conditions.
  2. Río San Juan boats have undated published timetables that do not always agree between sources: confirm them at the San Carlos dock.
  3. El Castillo village is pedestrian: there are no cars and it is reached by river, according to INTUR.

Safety and precautions

  • The United States advises travellers to reconsider travel (level 3, advisory reissued on 14 May 2026) due to crime, limited healthcare, wrongful detention and arbitrary enforcement of local laws.
  • According to the United States, Nicaragua has denied entry to or expelled US citizens, particularly people linked to NGOs, universities, churches or the media, and checks their social media.
  • Canada advises a high degree of caution throughout the country (update of 31 August 2026) due to the political situation, the potential for civil unrest and crime.
  • Spain advises extreme caution (update of 26 May 2026).
  • The United Kingdom has no resident embassy in Nicaragua and supports its citizens from San José (Costa Rica).
  • Nicaraguan law bars foreigners from any political activity: taking part in protests or spreading criticism, including on social media, can lead to detention or deportation, according to Canada and the United Kingdom.
  • Use authorised red-plate taxis or radio-dispatched taxis: the United Kingdom warns of express kidnappings in unauthorised taxis.
  • Canada notes that border areas see more crime and violence, and that criminal gangs are more active in the border areas with Costa Rica and Honduras.

Frequently asked questions

What are El Castillo Fortress's hours?

Monday to Friday, 8:00 a.m. to 5:00 p.m., and Saturdays and Sundays, 8:00 a.m. to 4:00 p.m., according to INTUR (page modified on 23 July 2026). The sources read do not publish the fee.

Can you visit Indio Maíz?

Only in part: according to the Río San Juan tourism portal, MARENA does not allow entry to most of the reserve and there are two access areas. No MARENA rule was read.

How do you get to Solentiname?

By boat from San Carlos, according to INTUR (2022). The Río San Juan tourism portal, undated, lists departures on Tuesdays and Fridays.

Río San Juan · Practical guide

Sources consulted

Information checked in . Prices, hours and rules change: confirm them with the official source before you travel.

  1. INTUR (Mapa Nacional de Turismo) – Municipio de El Castillo (modificada 23 jul. 2026)2026
  2. INTUR (Mapa Nacional de Turismo) – Municipio de San Carlos (modificada 23 jul. 2026)2026
  3. INTUR (Mapa Nacional de Turismo) – Fortaleza de la Inmaculada Concepción (2022)2022
  4. INTUR (Mapa Nacional de Turismo) – Reserva Biológica Indio Maíz (2021)2021
  5. Río San Juan (portal de INTUR) – Indio Maíz Biological Reserve (sin fecha)2026
  6. El 19 Digital – Guardianes de la Reserva Indio Maíz (16 may. 2023)2023
  7. INTUR (Mapa Nacional de Turismo) – Archipiélago de Solentiname (2022)2022
  8. Río San Juan (portal de INTUR) – Transporte (sin fecha)2026
  9. ViaNica – Refugio de Vida Silvestre Los Guatuzos (sin fecha)2026
  10. Gobierno de Canadá – Nicaragua travel advice (31 ago. 2026)2026
  11. Ometepe Nicaragua Travel Guide – Ferry schedule (ago. 2023)2023
  12. Sandy Feet – Río San Juan (© 2015-2026)2026

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