The southern boundary of the North Pacific Winter Seasonal
Zone is—the parallel of latitude 50°N from the east coast
of the USSR to the west coast of Sakhalin, thence the west coast of
Sakhalin to the southern extremity of Cape Kril'on, thence the rhumb
line to Wakkanai, Hokkaido, Japan, thence the east and south coasts
of Hokkaido to longitude 145°E, thence the meridian of longitude
145°E to latitude 35°N, thence the parallel of latitude 35°N
to longitude 150°W and thence the rhumb line to the southern extremity
of Dall Island, Alaska.