Why do most asylum seekers enter via Quebec?

Radio-Canada’s La Vérif asked why most asylum seekers fleeing the U.S. come into Canada via Quebec, and the answer is geography: New Brunswick has massive forests that need to be traversed, Ontario has the moat of the Great Lakes, towns and villages are too sparse on the Prairies, and then there are the Rockies. Only here do we have towns close to the border and a few easy spots where a person can get close to the border and walk across.