Kasilag Pass is the ice-covered saddle of elevation 2150 m situated next west of Mount Mullen

Mount Mullen

Mount Mullen is a double-peaked mountain 2.5 mi east-southeast of Mount Milton in south Sentinel Range, Ellsworth Mountains in Antarctica. The mountain rises to 2400 m at the west extremity of Petvar Heights, and together with Kasilag Pass forms the divide between Kornicker Glacier and Wessbecher...

 and separating Petvar Heights

Petvar Heights

Petvar Heights are the heights rising to 2400 m in southeast Sentinel Range, Ellsworth Mountains in Antarctica. The feature occupies an oval shaped area with a diameter of 21 km, separated from the rest of Sentinel Range by Wessbecher Glacier to the southwest, Kasilag Pass to the west, and...

 to the east from the main crest of south Sentinel Range

Sentinel Range

The Sentinel Range is a major mountain range situated northward of Minnesota Glacier and forming the northern half of the Ellsworth Mountains in Antarctica. The range trends NNW-SSE for about and is 24 to 48 km wide...

 in Ellsworth Mountains

Ellsworth Mountains

The Ellsworth Mountains are the highest mountain ranges in Antarctica, forming a long and wide chain of mountains in a north to south configuration on the western margin of the Ronne Ice Shelf. They are bisected by Minnesota Glacier to form the northern Sentinel Range and the southern Heritage...

, Antarctica. It is part of the glacial divide between Kornicker Glacier

Kornicker Glacier

Kornicker Glacier is a glacier flowing northeastwards from the cirque bounded by Mounts Liptak, Southwick, Milton and Mullen in southern Sentinel Range, Ellsworth Mountains in Antarctica. The glacier merges with the terminus of southeast-flowing Thomas Glacier as both glaciers emerge from the...

 to the north and Wessbecher Glacier

Wessbecher Glacier

Wessbecher Glacier is a glacier about 7 nautical miles long, draining south between Wilson and Marze Peaks at the south end of the Sentinel Range, Ellsworth Mountains. First mapped by United States Geological Survey from surveys and U.S. Navy air photos, 1957-59. Named by Advisory Committee...

 to the south.

The feature is named after the settlement of Kasilag in Western Bulgaria.

Location

Kasilag Pass is centred at 78°46′56"S 84°48′47"W, which is 2.44 km northeast of Mount Inderbitzen

Mount Inderbitzen

Mount Inderbitzen is a mountain rising to over 2,600 m, located 12 mi south-southeast of Mount Craddock and 1.5 mi south of Mount Milton in the southern part of the Sentinel Range, Ellsworth Mountains in Antarctica. It surmounts Wessbecher Glacier to the southeast and Sirma Glacier to the...

 and 2.13 km southeast of Mount Milton

Mount Milton

Mount Milton is a mountain located 11 nautical miles south-southeast of Mount Craddock and 1.5 nautical miles southeast of Mount Southwick, in the south part of the Sentinel Range, Ellsworth Mountains in Antarctica...

. US mapping in 1961, updated in 1988.

Maps

• Vinson Massif. Scale 1:250 000 topographic map. Reston, Virginia: US Geological Survey, 1988.