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## Third Chapter: Special Features of Devadvipa etc. [27]
**Question:** O Bhagavan! How does the depth of the salt ocean increase? In other words, how much does the depth increase for every distance travelled?
**Answer:** O Gautama! The depth of the salt ocean increases by one *prastha* (a unit of measurement) for every 95 *prasthas* travelled from both sides (from the edge of Jambudvipa and from the edge of the salt ocean). Similarly, the depth increases by one *balagra* (hair tip) for every 95 *balagras* travelled, by one *likkha* (a unit of measurement) for every 95 *likkhas*, by one *yavamdhya* (middle of a barley grain) for every 95 *yavamdhyas*, and so on. The same applies for *angula* (finger), *vitasti* (span), *rasni* (hand), *kukshi* (belly), *dhanush* (bow), *kośa* (a unit of measurement), *yojana* (a unit of measurement), *hundred yojanas*, and *thousand yojanas*.
**Question:** O Bhagavan! How does the height of the salt ocean increase? In other words, how much does the height increase for every distance travelled?
**Answer:** O Gautama! The height of the salt ocean increases by sixteen *prasthas* for every 95 *prasthas* travelled from both sides.
**Answer:** O Gautama! This pattern continues, so for every 95 *thousand yojanas* travelled, the height increases by sixteen *thousand yojanas*.
**Explanation:** The depth of the salt ocean increases by one *prastha* for every 95 *prasthas* travelled from both the edge of Jambudvipa and the edge of the salt ocean. Similarly, the depth increases by one *balagra* for every 95 *balagras* travelled. The same applies for *likkha*, *yavamdhya*, *angula*, *vitasti*, *rasni*, *kukshi*, *dhanush*, *kośa*, *yojana*, *hundred yojanas*, and *thousand yojanas*. This means that for every 95 *thousand yojanas* travelled, the depth increases by one *thousand yojanas*.
Now, if the height increases by one *thousand yojanas* for every 95 *thousand yojanas* travelled, then according to the rule of three, the height increase for 95 *yojanas* can be calculated as follows:
* Set up the three quantities: 95000 / 1000 / 95
* Remove the three zeros from the first two quantities (according to the rule "zero divided by zero is zero"): 95 / 1 / 95
* Multiply the middle quantity (1) by the last quantity (95): 1 x 95 = 95
* Divide the result (95) by the first quantity (95): 95 / 95 = 1
This means that the height increases by one *yojana* for every 95 *yojanas* travelled. This is what is stated in these verses.