Biso Kotuwa of Deepa Uyana in Polonnaruwa (දීප උයනේ බිසෝකොටු සොරොව්ව)
Immediately behind the Polonnaruwa Rest House, now known as ETKO Lake House, lies a remarkable brick Biso Kotuwa (valve pit) once connected to the Parakrama Samudraya. Constructed during the reign of King Parakramabahu I (1153–1186 CE), this structure regulated the water flow supplied to the Deepa Uyana, the royal park.
