In Washington State, USA, there is a 200 metre exclusion zone for endangered Southern resident orca of the Pacific Northwest. In other words, you must not get closer than this distance. A boater in Washington State may face a fine for entering the exclusion zone around a group of orca near Orcas Island on Wednesday. Getting too close to these animals can disturb their natural behaviour, interfere with their communication and cause them stress.
http://blogs.seattletimes.com/today/2012/08/coast-guard-boater-may-face-fine-for-entering-protected-killer-whale-zone/