Eua 'Eua is a large hilly island near Tongatapu. Eua is one of the oldest islands of the Pacific, 19km long and 7.5km wide with the highest point 312m. Millions of years ago sections of the sea floor were pushed up and tilted by huge earth movements.
Sedimentary rock is round on the ridgetops.
On the narrow eastern side different limestone layers have eroded away forming high cliffs and steep valleys. There are spectacular views and deep limestone holes, passages, caves, pools, springs and streams. On the western side the land slopes in three terraces and the villages are on a wide plain about 100m above sea level. The last remaining stands of thick Tongan rainforest are found clinging to the steep south eastern spine of the island, where unfortunately it is still being destroyed by slash and burn farmers. Eua is a large hilly island near Tongatapu.