| Guesalaga Peninsula | |
| Image Map Caption: | Greenwich Island in the South Shetland Islands |
| Pushpin Map: | Antarctic Peninsula#Antarctica |
| Pushpin Map Caption: | Location on Antarctic Peninsula##Location in Antarctica |
| Pushpin Map Relief: | yes |
| Location: | Antarctica |
| Coordinates: | -62.4793°N -59.6667°W |
| Archipelago: | South Shetland Islands |
| Population: | uninhabited |
| Country: | Antarctica |
| Treaty System: | Antarctic Treaty System |
Guesalaga Peninsula is a small, L-shaped, low-lying shingle covered peninsula on the east side of Discovery Bay, Greenwich Island in the South Shetland Islands, Antarctica forming the northwest coast of Iquique Cove and the north side of its entrance. The feature is projecting 7000NaN0 southwestwards and 3000NaN0 wide, with the narrow shingle Reyes Spit (-62.4795°N -59.6747°W) extending 4000NaN0 southwestwards from its west extremity Reyes Point (-62.4789°N -59.6704°W) into Discovery Bay. The Chilean Antarctic base Arturo Prat is situated on the peninsula.
Guesalaga Peninsula is named after Captain Federico Guesalaga, leader of the 1947 Chilean Antarctic Expedition in the frigate Iquique and the transport ship Angamos that established Arturo Prat Base, while Reyes Point and Reyes Spit are named after Navigation Second Sergeant Camilo who was in charge of navigation instruments in the Iquique.
The peninsula is centred at -62.4793°N -59.6667°W which is 1.38km (00.86miles) south-southwest of Ash Point, 2.67km (01.66miles) north-northeast of Ferrer Point and 5.03km (03.13miles) southeast of Spark Point (Chilean mapping in 1951 and 1971, British in 1964 and 1968, and Bulgarian in 2005 and 2009).
