A peninsula in the middle of Lake Mekinac, on East bank (in the municipality of Trois-Rives) is designated the Trou-du-Steamboat. It is located off the bay designated Bras Grosleau (Grosleau Arm) whose top of the neighbor mountain (north side) reaches over 320 meters. In this area, the mountains on the east side of the lake form a long promontory which falls into the lake Mekinac. Consequently, navigators have few places to hide when the wind rises.