Cardigan Bay in Wales is one of the best destinations for seeing dolphins in Europe. The bay is located between the counties of Pembrokeshire, Ceredigion, and Gwynedd (far west coast). Here around 300 Bottlenose Dolphins are residents of a special conservation area.
Daily in summer, you'll see these fun animals leaping out of the waters. The area between Cardigan Island in the south and Aberporth in the north is a great viewing spot to see bottlenose dolphins between June and September. Though, you can see them year round. The summer months are best with New Quay being the hottest spot (June-October). Take one of the daily charter boats out there for a fantastic trip. You can watch porpoises and even orcas, basking sharks, and whales as well.