About Observation Post #18 Unimak Pass, Alaska, USA (49.15N, -129.67W) Most northbound whales (except for the early ones) migrate through narrow Unimak Pass in June. This narrow sea passage is in the NE Aleutian Islands. From here they are just a few weeks away from their arctic feeding grounds! Unimak Pass Alaska (49.15N, -129.67W)