According to Pytheas, he travelled around "the whole of Britain that was accessible," possibly making his way around the entire perimeter of the island.
He described the native British population as being simple in their manners and happy with their plain food. He observed that their societies were ruled by many kings and princes who lived in peace among each other.
Pytheas also wrote that he visited a land named Thule. He said it was a six days' journey north of Britain and near a frozen sea. Pytheas reported that sunlight was visible in all hours of the day during the peak of summer. There has been uncertainty about the exact location he meant.
In addition, Pytheas is the first known explorer to describe the Germanic tribes in Northern Europe as well, although his work has been lost.
Also of note is his curiosity about the tides. In an age before widespread scientific knowledge, he was the first to propose a link between the moon and the tides.
