Istanaombak is located in a bay with a left on one side and right on the other and both work at a bunch of tides and sizes. This bay is located in central Java and faces South and catches any kind of swell. From the most west south west swell to the rare south east swell.
The left has many moods, from playful and rippable to heavy, powerful and unpredictable. The more southerly the swell, the longer and more predicable and playful the left will be. Behind the wave a shelf drops quickly to deep water. This rapid transition makes it a really heavy wave when over 5 foot, especially at low tide. On bigger swells and lower the tides you can get the biggest barrel of your life but below 5 foot on high tide it’s a powerful but super rippable wave.
The right is a hollow peak on most tides, providing more ripable waves with more water over the reef. Westerly swells are best for the right, pushing further down the reef for a longer ride. Long-period southwest swells in the 2-to-6 foot range are ideal. The bigger it is the higher it needs to be. The higher the tide the more it turns into a ripple wave and the end section isn’t to shallow. When the swell is bigger then 5 foot. The current can cause bumps up the face on the out going tide as the water rushes out over the reef as the channel is very small. When bigger and lower tides its for experienced surfers only. When it’s a little higher and small its a safe wave for all levels of surfing.
Best time of the year is the dry season May through October. But even through the wet season there is plenty of swell just the winds tend to be more variable and the trade offshore’s of the dry season aren’t as common.