a port of call
port of call
1. A port visited by a ship among others on a voyage. The sailors were thrilled to finally see a port of call after months at sea.
2. A short stop during a trip or journey. Harold's first port of call on his trip across Europe was Paris.
a ˌport of ˈcall(informal) a place where you go or stop for a short time, especially when you are going to several places: Our first port of call this morning is the bank.
These two idioms refer to ports where ships stop for a short time during a voyage.