The area was visited by early 19th century sealers.

[1] The island is named after the settlement of Prosechen in Northeastern Bulgaria.

[2] Prosechen Island is located at 62°37′23″S 61°17′44″W / 62.62306°S 61.29556°W / -62.62306; -61.29556, which is 1.04 kilometres (2⁄3 mi) south of Cape Sheffield and 500 metres (1⁄3 mi) north by east of Ugain Point.

It is separated from Rugged Island to the north and Toledo Island to the south by 70 metres (230 ft) and 60 metres (200 ft) wide passages respectively.

[1] This article includes information from the Antarctic Place-names Commission of Bulgaria which is used with permission.