Pura Ulun Danu Bratan is a location stamp in SLOWLY. This can be unlocked when you visit Indonesia.
Information[]
"Pura Ulun Danu Bratan or Pura Bratan, is a major Hindu Shaivite Shiva temple in Bali, Indonesia. The temple complex is on the shores of Lake Bratan in the mountains near Bedugul.
The water from the lake serves the entire region in the outflow area; downstream there are many smaller water temples that are specific to each irrigation association (subak). "
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Text and image from Wikipedia.
Method[]
This stamp is unlocked by logging into your account while inside the country. Any other local stamps will also be unlocked at the same time.
You will keep it and be able to send to other penpals even after you return from your trip.