Iskaal is a ruined tuskarr village located east of Kamagua in the Howling Fjord. [33.8, 63.6] You can get there by taking the Ancient Lift. It is currently controlled by the Northsea Freebooters. Abdul the Insane is found on the ship nearby.
The surviving tuskarr made their escape to Kamagua.
The name Iskaal could be a play on "Iskall", a swedish word for freezing cold ("Is" means ice and "kall" means cold). The name could just be a coincidence. It would however fit with the climate in the Howling Fjord.