Click to watch Nic Von Rupp tackling mind-blowing waves at Lisbon’s ultimate River Mouth pointbreak in the new episode of Portugal Back-to-Back. Mar da Calha is a rarely-surfed mysto spot breaking at the mouth of the mighty Tagus River. It’s only when perfectly groomed sandbars combine with clean swell lines, that Mar da Calha comes alive and does its magic. Local charger, Ivo Santos, and multiple times European bodyboarding champ, Hugo Pinheiro, help Nic taking his Von Froth to a whole new level of frothing.