Name of River / Basin Area (km2) / Numbers of rain gage stations / Area in km2 per station
Tone River (Japan) / 16,840 / 420 / 40.1
Solo River (Indonesia) / 15,840 / 23 / 688.6
Cagayan River (Philippines) / 27,280 / 10 / 2,728.0
Pampanga River (Philippines) / 10,540 / 25 / 421.6

the numbers of Rain gage station (source: River Information System(ICHARM),)

(Source: WMO, Guide to Hydrological Practices(WMO No.168) 6th Edition, 2008, I.2-24 )

Name of River / Basin Area (km2) / Numbers of rain gage stations / Area in km2 per station
Han, Imjin, Ansung Rivers, (Korea) / 38,554
South Korea 28,738 / South Korea 147 / 195.496

Information on July 2014.

Name of River / Country / 1. Basin Area (km2) / 2. Numbers of rain gage stations / Area in km2 per station
(1./2.)
Nyando / Kenya / 3,620 / 12 / 301.7
Sondu / Kenya / 3,508 / 6 / 584.7
Gucha-Migori / Kenya / 6,600 / 23 / 287.0
Mara / Kenya, Tanzania / 8,705 / 16 (Kenya)
10 (Tanzania) / 334.8
Wang Chu / Bhutan / 4,603 / 12 / 383.6
Ca River / Vietnam
Laos / 17,200 (Vietnam)
10,200(Laos) / 60 (Vietnam) / 287
Salawin / Thailand / 17,920 / 9 / 1991.1
Mae Khong / Thailand / 57,422 / 126 / 455.7
Kok / Thailand / 7,895 / 5 / 1579.0
Shi / Thailand / 49,477 / 124 / 399.0
Mun / Thailand / 69,700 / 145 / 480.7
Ping / Thailand / 33,898 / 39 / 869.2
Wang / Thailand / 10,791 / 13 / 830.1
Yom / Thailand / 23,616 / 40 / 590.4
Nan / Thailand / 34,330 / 37 / 927.8
Chao Phraya / Thailand / 20,125 / 63 / 319.4
Sakaekrang / Thailand / 5,191 / 14 / 370.8
Pasak / Thailand / 16,292 / 19 / 857.5
Thachin / Thailand / 13,682 / 35 / 390.9
Mae Klong / Thailand / 30,837 / 23 / 1340.7
Prachinburi / Thailand / 10,481 / 11 / 952.8
Bang Pakong / Thailand / 7,978 / 23 / 346.9
Tonglesap / Thailand / 4,150 / 6 / 691.7
East Coast / Thailand / 13,830 / 31 / 446.1
Phetchaburi / Thailand / 5,603 / 11 / 509.4
Prachuap Kiri Khan Coast / Thailand / 6,745 / 18 / 374.7
South East Coast / Thailand / 26,353 / 43 / 612.9
Ta Pi / Thailand / 12,225 / 23 / 531.5
Songkhla Lake / Thailand / 8,495 / 52 / 163.4
Pattani / Thailand / 3,858 / 0
South West Coast / Thailand / 21,172 / 41 / 516.4
Cagayan / Philippines / 27,752 / 10 / 2775.2
Magat (tributary of Gagayan River) / Philippines / 4,143 / 5 / 828.6
Brahmaputara / Bangladesh / 39,100 / 13 (FFWC),6 (BMD) / 2057.9
Ganges / Bangladesh / 46,300 / 17 (FFWC),14 (BMD) / 1493.5
Meghna / Bangladesh / 35,000 / 15 (FFWC),3 (BMD) / 1944.4
South Eastern Hill Basin / Bangladesh / 17,000 / 8(FFWC), 12 (BMD) / 850
Katsina-Ala / Nigeria / 2,500 / 0