The kingdom of . the highertracts and border on the swamps in many parts, donot render all vegetation impossible. The moreelevated laterite and stony ridges are mostly coveredwith, forets clairteres, i. shadeless forests of sparse,poor, dwarfish trees; this kind of forest is largelydispersed in the lower parts of the Mekong the somewhat elevated ridges of deposits alongthe streams belts of proper forests are usually grow-ing, and on these ridges the settlements and therice-fields of the sparse inhabitants are found. The plain of Talesap is an alluvial lowland, ele-vated abo


The kingdom of . the highertracts and border on the swamps in many parts, donot render all vegetation impossible. The moreelevated laterite and stony ridges are mostly coveredwith, forets clairteres, i. shadeless forests of sparse,poor, dwarfish trees; this kind of forest is largelydispersed in the lower parts of the Mekong the somewhat elevated ridges of deposits alongthe streams belts of proper forests are usually grow-ing, and on these ridges the settlements and therice-fields of the sparse inhabitants are found. The plain of Talesap is an alluvial lowland, ele-vated about from ten to twenty metres above thesea-level. Ranges of wooded hills separate it fromthe Korat plateau, the plain of the BangpakongRiver, and the coast of the Gulf of Siam. Theplain and adjacent hill regions drain into the greatlake by the Kanburee River and its tributaries,among which Sangke River is the most important,and by some smaller streams. The lake is in con-nection with the Mekong and serves that river as a. W o o h-) Ph A General Description of Siam 51 regulating basin, so that the water-level of the lakerises and falls with the floods of the river in such away that in the connecting channel it alternatelyruns from the lake to the river and in the reversedirection. This causes the lake to silt up rapidly. In consequence, there is a difference of about ninemetres between high and low water-level, and at thehigh level the lake extends its water over the plainso that the greatest part of it is deeply flooded. Thelake is bordered by a belt of aquatic shrub growingin the soft mud. The solid plain more inland, owingto the fertility of the soil of sandy clay, when theflood recedes is soon turned into an endless jungle ofhigh grass where countless deer feed. In the higherregion of older formation the forets clairieres appearand, on the hills, forests proper. In the height of thedry season the lake becomes a shallow swamp; therivers grow quite dry or leave only some dirty


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