Isla Patricio Lynch

Isla Patricio Lynch is a large island in the Pacific Ocean off the southern coast of Chile, south of the Golfo de Penas and part of the Archipiélago Campana. Administratively it belongs to the commune of Tortel in the province of Capitán Prat, Región de Aysén del General Carlos Ibáñez del Campo.¹ It is named after Admiral Patricio Lynch, the Chilean naval officer who took a prominent part in the War of the Pacific (1879–1884).²

Geography and coastline

The Chilean Sailing Directions describe the surrounding waters as rocky: the west side faces the open Pacific and is foul ground up to 7 miles from land, and a narrow channel entered just north of Punta Conglomerada separates Isla Cabrales from Isla Patricio Lynch, leading 17 miles to Canal Octubre.⁴

Relief. The island is mountainous. A cordillera runs along its western side, including pico Breaker (846 m in the coastal description, 853 m in the summary table), the montes Maipo and Lafrenz, monte Pardo at 600 m, and, at the southern end, the picos Paralelos at 630 m. Named coastal features include Punta Roquerío at the northwest extremity, south of the entrance to Canal Octubre, and Punta Baja on the northwest coast a short distance south of Punta Roquerío.^{5 • 6} Seno Merino opens on the eastern side of the island, on the west shore of Canal Octubre, and Seno Araya opens on its north coast in the southern part of the same canal.^{7 • 8}

Human history and conservation

Protected status. The island is one of the islands listed as forming Reserva Nacional Katalalixar, a 674,500-hectare reserve in the commune of Tortel created by Supreme Decree 780 of 21 December 1983, which also contains the outer channels Martínez and Baker and the inner channels Fallos and Messier.³ Within the hydrographic unit defined for the island, 47,730 hectares, or 56.454 percent, fall under a national reserve, and 76,143 hectares, or 90.059 percent, lie within the biodiversity priority site "Archipiélago W Canal Messier".^{9 • 10}

Vegetation. Just over half the island, 43,453.63 hectares or 51.395 percent, carries the terrestrial ecosystem described as coastal temperate-antiboreal evergreen forest of Nothofagus betuloides and Drimys winteri.¹¹ Seal rookeries (loberas) are recorded on rocky islets off the island's northwest coast, at the outlet of Canal Octubre north of Punta Roquerío and in front of Punta Baja.¹²

Hydrographic and survey data

Chile's Dirección General de Aguas basin inventory assigns the island its own sub-basin, number 1186, within basin 118, "Costeras entre R. Pascua Límite Región, Archipiélago Guayeco", with an exorheic regime and a listed value of 845.6.¹³ The biodiversity platform's political-administrative tables give the island's area as 53,389.805 hectares, about 533.9 km², which is smaller than the 560.8 km² figure in the geographic summary; the two figures come from different official datasets and are reported here as published.¹ The island represents 2.663 percent of the commune of Tortel, 1.463 percent of the province of Capitán Prat, and 0.499 percent of the Aysén Region.^{1 • 14 • 15}

The island's remoteness is a practical constraint on fieldwork: a fisheries survey of sea-lion colonies reported that the exposed coast of Isla Patricio Lynch, at the boundary with the Magallanes Region, could not be surveyed because of bad weather.¹⁶ The surrounding waters are also a fishing area: the principal Pacific spawning zone for southern hake (Micromesistius australis) includes the fishing grounds of the Golfo de Penas and Isla Patricio Lynch.¹⁷

References

1. Comuna "Tortel", Plataforma Políticas de la Biodiversidad, MMA Chile
2. Patricio Lynch (Isla), Diccionario Jeográfico de Chile (Luis Risopatrón, 1924), Wikisource
3. Reserva Nacional Katalalixar, CONAF
4. Sailing Directions Pub. 125, West Coast of South America (Chile: Cabo Tres Montes to Estrecho de Magallanes)
5. Roquerío (Punta), Diccionario Jeográfico de Chile/R, Wikisource
6. Baja (Punta), Diccionario Jeográfico de Chile, page 89, Wikisource
7. Merino (Seno), Diccionario Jeográfico de Chile, page 575, Wikisource
8. Araya (Seno), Diccionario Jeográfico de Chile, page 71, Wikisource
9. Subsubcuenca "Isla Patricio Lynch", Plataforma Políticas de la Biodiversidad
10. Sitio Prioritario "Archipiélago W Canal Messier", Plataforma Políticas de la Biodiversidad
11. Ecosistema terrestre "Bosque siempreverde templado-antiboreal costero de Nothofagus betuloides - Drimys winteri", Plataforma Políticas de la Biodiversidad
12. Censo de loberas, regiones XIV, X y XI, metadatos MMA Chile
13. Inventario de cuencas, subcuencas y subsubcuencas de Chile, Dirección General de Aguas, MOP (2014)
14. Provincia "Capitán Prat", Plataforma Políticas de la Biodiversidad
15. Región "Aysén del General Carlos Ibáñez del Campo", Plataforma Políticas de la Biodiversidad
16. Informe final, censo de loberas, Subpesca
17. Informe final, Centro Trapananda, Subpesca (Micromesistius australis spawning zones)

Topic: Encyclopedia › Places and geography › Landforms and terrestrial features › Islands and dry-land coastal features › Islands and island geography of the Americas

Initially written Oct 21, 2026 · Edited: Oct 25, 2026

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