Physical Feature of Lake

Fast Facts:

Watershed Area	87,072.00 hectares
Aggregate land area	72,372.00 hectares
Lake Surface	17,060.00 hectares (BFAR)
Shoreline	62.10 kilometers
Maximum Depth	223 meters
Mean Depth	128 meters
Volume	18.00 cu. Km.
No. of Tributaries	28 major rivers
Outlet of the Lake	Kalinawan River
Length (north to south)	29.10 kilometers
Climate:	Type II (maximum rainfall Nov. to Jan.)
Surface Temperature Ranges	27.00 ^ºC to 30.66^ºC
Dissolved Oxygen Ranges	5.90 to 8.01 mg OL^-1
PH Ranges	7.2 (40m) to 7.9 (0m)
Lake Classification	Oligotrophic Lake (PCAMRD)
Water Classification	Class A (EMB)
Total Population	142,344 (Census 2007, NSO)

Topography

The lake Mainit area straddles the Southern part of Surigao del Norte and northern part of Agusan del Norte comprising the eight municipalities. The Lake Mainit & its watershed is situated in a small peninsula extending North from Eastern side of Mindanao. The lake lies only 30 meters above sea level and is separated on the West side from Bohol Sea by Malimono ranges which is a narrow strip of land. The relief of the strip is uniformly sharp and includes numerous peaks forming a ridge between 500 to 600 meters above sea level. This continues to pass through the north end of the lake into the watershed of the Mayag River, which flanked on the west side by several peak exceeding 1,000 meters high. This valley is steep and much more irregular in the northwest portion of the watershed, but is gentle in the northeast portion. The east side flanked by Diwata mountain ranges with peaks as high as 1,000 meters.

Land Area: (by municipality from two provinces)

Province/Municipality	Area	Percentage

*Surigao del Norte*	*24,728*	*28 %*
Sison	1,310	1.5 %
Tubod	4,420	5.1 %
Mainit	9,772	11.2 %
Alegria	6,310	7.2 %
Others (Malimono,etc.)	2,916	3.4 %
*Agusan del Norte*	*64,344*	*72 %*
Kitcharao	10,485	12.0 %
Jabonga	19,060	21.9 %
Santiago	16,834	19.3 %
Tubay	7,450	8.6 %
Others (Cabadbaran)	8,515	9.8 %