Attanagalu Oya

Attanagalu Oya (Sinhala: අත්තනගලු ඹය) is a river in Gampaha District, Sri Lanka.[1][2]

Attanagalu Oya
Attanagalu Oya, near Dandugama
Native nameඅත්තනගලු ඹය  (Sinhala)
CountrySri Lanka
Physical characteristics
SourceKegalle District
MouthNegombo Lagoon
07°10′N 79°53′E
Length76 km (47 mi)
Basin size727 km2 (281 sq mi)
  minimum20 m3/s (710 cu ft/s)
  maximum225 m3/s (7,900 cu ft/s)

The length of the river is approximately 76 km, with a drainage basin of 727 km2[1][3][4] It drains into the Negombo Lagoon as Dandugam Oya.[5][6] The river is often a cause of floods to low-lying areas in theGampaha district.


  • Basnagoda Oya
  • Waharaka Oya
  • Alagama Oya
  • Oruwal Oya
  • Diyaeli Oya
  • Kimbulapitiya Oya/ Duhagala Ela
  • Mapalan Oya [5][4]


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