as of 2018, four pieces remain that are large enough to be tracked by the national ice center (at least 20 square nautical miles). one piece, b-15z, measures 10 nautical miles by 5 nautical miles. it was located in the southern atlantic ocean, about 150 nautical miles northwest of south georgia island. as it continues its move northward, the speed of melt increases. most icebergs do not last long this far north.