"The watermasses around Iceland were nicely visualized by the working group of Prof. Dr. Detlef Quadfasel (University of Hamburg) like shown in this youtube video. The largest "underwaterfall" on Earth is located in the Denmark Strait, where you can imagine the power of water if you imagine a 600m waterfall on land. The region between Iceland and the Faroes is known as "overflow region" where local eddies and water exchange do vary extremely even within 24 hours. The video also shoes the "cold North" and the "warm South" and the different water flows along the Reykjanes Ridge. Have a look and you may click twice or more... "