Located near the locality of Kanaaupscow, Amichikukamaskach Lake (length: 8.2 kilometres (5.1 mi) by 2.3 kilometres (1.4 mi) wide) is the head lake of the Roggan River, located to the west of the Robert-Bourassa Reservoir.

South of the Roggan River, a chain of hills (height between 6 metres (20 ft) to 60 metres (200 ft)) with a complex relief stretches long north-west of the Robert-Bourassa Reservoir.

According to geographer J. Keith Fraser, in Place Names of the Hudson Bay Region (1968), the term "Bishoproggin" is an anglicization of the Cree words pichipouian or peshipwaytok, or "fish tank".

However, no source shows a toponymic link with the country's clergy or religious history.

Locally, the Cree people designate the Roggan Amistustikwach, which means "three rivers".