Geographic isolation, where physical barriers prevent gene flow between populations, can cause reproductive isolation. This can lead to genetic differences accumulating over time, ultimately resulting in the development of separate species.
Two large islands in Europe are Great Britain and Ireland.
Most likely the countries with the largest Asian populations, which are most likely the UK and France.
The two largest islands of Japan are Honshu and Hokkaido.
It usually is some sort of physical barrier like an large space between islands.
sardinia and sicily islands
barbados and trinidad
There are many river islands in the British Isles but no two comprise them
baffin , arianaa
Britain and Ireland.
La Guadeloupe and La Martinique are two large French islands in the Carribbean. There are also smaller French islands nearby.
There are two countries in Europe that consist mainly of a peninsula with surrounding islands. Italy, which has three large islands and Greece, which has a large number of smaller islands.