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Targeting is city-level or country-level, so "South Kalimantan" itself is not a dial. In practice you target one of its cities, say Banjarmasin, Banjarbaru, Martapura, and widen to the Indonesia exit when a single city runs thin. That wide fallback is the request that never depends on one place having supply today.

To most sites, no: geo-checks overwhelmingly stop at the country, and any Indonesia exit passes them. The province matters when your question is local to it, stock, delivery, local search, regional pricing, and then the right move is one of its cities, not the province as an abstraction.

The 481 biggest of its 481 listed places, from Banjarmasin down. Each has its own page with live availability stated on it; smaller places ride with their province and the Indonesia exit.

Because the province and its cities do not move, and pages should not either. Residential supply in any single city is fluid for every provider in this industry. We publish the stable geography, state plainly what is live when you ask, and keep the Indonesia exit one click away.