The Hidden Marvel: Yathuru Pokuna (Key Pond) at Ruwanweli Maha Seya Monastery

When visiting the sacred Ruwanweliseya, most pilgrims focus on the grand stupa itself. However, hidden within the monastery complex lies an ancient engineering wonder—the Yathuru Pokuna, or "Key Pond." This unique water reservoir, shaped like an old-fashioned key, is a testament to the ingenuity of Sri Lanka’s ancient builders.

What is a Yathuru Pokuna?

The name "Yathuru Pokuna" translates to "Key Pond" in English, referring to its distinctive key-like shape. These ponds were designed with:

  • A long, straight staircase (the "shaft" of the key)
  • A circular or rectangular pool at the end (the "bow" of the key)

Four such ponds exist in Anuradhapura:

  1. Two at Jethawanaramaya Monastery (Yathuru Pokuna I & II)
  2. One at Abhayagiri Monastery
  3. One near Ruwanweli Maha Seya (the largest and most impressive)

The Unique Design of Ruwanweli Seya’s Yathuru Pokuna

Unlike the Jethawanaramaya ponds, which have a sharp right-angle turn in their staircases, the Ruwanweli Seya’s Yathuru Pokuna has a simpler, straight descent leading to a large, circular pool. This pond, also called Kantaka Kupa, stands out for its:

  • Massive stone construction – Perfectly carved blocks fitted tightly without mortar.
  • Expanding shape – The pond widens from the bottom to the top.
  • Ancient water management – Evidence of an underground water inlet suggests an advanced hydraulic system.

A Sacred Water Source for Monks

While no historical records specifically mention this pond, it likely served as a water source for monks residing in the Maha Viharaya Monastery. Its strategic location—just 25 meters from the stupa—indicates its importance in daily monastic life.

Why Most Visitors Miss It

Despite its significance, few pilgrims know about this hidden gem because:

  • It lies inside the Sangawasa (monks' quarters).
  • A white wall surrounds it, making it easy to overlook.
  • Access is restricted—visitors must seek permission from a monk to enter.

How to Find the Yathuru Pokuna

If you wish to see this marvel:

  1. Enter Ruwanweli Seya from the outer Vahalkada ruins.
  2. Walk along the white wall until you see a small gate with steps.
  3. Politely ask a monk for permission to view the pond.


A Testament to Ancient Engineering

The Yathuru Pokuna is more than just a pond—it’s a masterpiece of ancient hydraulic engineering and a silent witness to the daily lives of Buddhist monks over two millennia ago.

Have you seen this hidden wonder? Share your experience in the comments!


THE AUTHOR BY: I.D.M.V.B.ILANGANTHILAKA 

https://www.youtube.com/@StellarPath0722

https://www.pinterest.com/wimukthibi/_pins/

https://www.youtube.com/@SkylineNook-z7y

Location: Ruwanweliseya Temple, Abhayawewa Rd, Anuradhapura, Sri Lanka

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