lo2 JOURNAL, JSATURAL HIST. SOCIETY OF SIAM. VoL I. 



iMUiitry) it appears that trips of more than two weeks duration neces- 

 sitate a considerable force engaged in bringing up supplies from a base. 

 As no description of this part of the country, so far as lam 

 aware, has ever been given, it may be of interest if I shortly describe it. 

 The i^etchaburi river, as it trickles beneath the bridge at the 

 town of Petcliaburi in the dry season, is an insignificant looking 

 stream, and gives little indication of the fact that its course is upwards 

 of 80 miles in length, draining an area of 1200 square miles, 600 of 

 which are mountains of considerable elevation in the direct line of the 

 S. W. monsoon. 



The source of this river is in N. Lat. 12° 40,' E. Long. 99° 20,' 

 this point being the birthplace of two other big streams : — the Huey 

 Sat Yai (Big Beast river) which flows East into the Pran river, and 

 the Cha-ra-wah flowing West into the Tennasserim river. From it^ 

 source the Petchaburi river flows due North for 20 miles to the 

 Elephant's Tusk rapid, where it is joined by the Menam Bang Kloi, 

 Avhich latter has its source some 17 miles to the N. W. The ground 

 level at the junction is 145 metres above sea level and the boundary is 

 distant westwards some 10 miles or four days' march. 



The Elephant's Tusk is an impassable rapid for dug outs, — the 

 banks being precipitous there is no opportunitj^ as at other bad rapids, 

 of dragging the canoes through overgrown shallows at the sides of the 

 main stream. 



From this point the river flows some 18 miles due East when 

 the first Kariang hamlet is reached, viz: — Ta Ling Lorn (Wind monkey 

 landing) and a further 12 miles E. S. E. carries one to Sarahett. Here 

 the river makes a sharp bend and flows due N. E. to Petchaburi town. 

 The northern portion of this area is drained by the Meh Pache'C 

 river which rises with the Bang Kloi in N. Lat. 13° 10' and flows due 

 North some 50 miles where it joins the Quaa Noi. 



The area to the south of the Petchaburi watershed is drained by 

 the Pran river, the source of which lies some 10 miles N. E. of the 

 source of the Petchaburi river and about 10 miles on the Eastern or 

 Siamese side of the boundary range. 



All these three rivers for the first 20 miles of their courses lie 

 in deep gorges, together with their hundreds of tributaries. Only 

 occasionally dosmall flats occur in the bottoms, and these are seldom 

 of any extent. The greatest altitude found was 1505 metres (5000 ft.) 



