In 1251 he accepted Roman Christianity, and in 1253 he joined the western political hierarchy through coronation at the hands of a papal legate. Underlying rock structures are of little significance for the contemporary Lithuanian terrain, which basically is a low-lying plain scraped by Ice Age glaciers that left behind thick, ridgelike terminal deposits known as moraines.
The Baltic coastal area is fringed by a region characterized by geographers as the maritime depression, which rises gradually eastward.
A distinctive feature of the Lithuanian landscape is the presence of about 3,000 lakes, mostly in the east and southeast.
The boggy regions produce large quantities of Lithuanian soils range from sands to heavy clays.
About four-fifths of the population is Roman Catholic; there are smaller groups of Evangelical Lutherans and other Protestants, as well as people of other faiths.
Swamps and marshlands account for only a small percentage of the total land.Average annual rainfall usually exceeds 30 inches (about 800 mm), diminishing inland.Rainfall reaches a peak in August, except in the maritime strip, where the maximum is reached two to three months later. Spruce trees are prevalent in the hilly eastern portion.The lowland, consisting of glacial lake clays and boulder-studded loams, stretches in a wide band across the country from north to south; some portions of it are heavily waterlogged.The elevated Baltic Highlands, adjacent to the central lowland, thrust into the eastern and southeastern portions of the country; their rumpled glacial relief includes a host of small hills and numerous small lakes.