Search under way after SA boat capsize

One man has been rescued and another is missing after their boat capsized at Beachport in South Australia's southeast.

Emergency services have rescued one man and are searching for another man after their boat capsized off a coastal town in South Australia's southeast.

SA police say emergency services are at the Beachport boat ramp after getting a call at 8am on Saturday about the capsize.

A police helicopter and local boats are helping in the search for the missing man.