After the river trip we headed down river and anchored for the night near the river entrance. We left early while it was still dark for a 200 mile overnight passage to Nangka Island. It was a good, fast passage with plenty of wind and not many fishing boats. We only anchored overnight at Nangka and took off the next morning as it was overcast and didn't look inviting in that weather. We motored most of the day to get to Belitung. Belitung is a decent sized island off the east coast of Sumatra with about a quarter million inhabitants. The island was British for awhile till it was traded to the Dutch in 1824. It exports pepper and tin. The large Dutch mining company Billiton was named after the island and founded to mine tin here in 1851 (it has now merged with the Australian company BHP, Broken Hill Proprietary).
There's an interesting, cruiser friendly resort on the beach near the anchorage, The Rock and Wreck Dive Resort https://rockandwreckresort.com/. It is constructed out of old wrecked boats, along with old, abandoned houses that were on the island. They were dismantled and rebuilt onsite as cottages for the guests.
Leaving the Kumai River there is a good anchorage near the peninsula just off the river mouth. It seems a lot nicer than the one mentioned in the Scott guide that is pretty close to the busy channel. We headed in along the beach at low tide over a section with minimum depth of 9.8 feet. There were two boats anchored there. We continued on toward the pier. Before getting there, there is a 20 foot deep 'hole' area that we anchored in. Don't need much scope as its sand and up hill in all directions. It is well away from the channel and the tugs with tows making their sharp turns.
Passage to Nangka. This is about a 200 mile run, so we left at o'dark thirty and worked our way up the channel and out the bay in the dark. Had a great sail the rest of the way. Downwind 15-23kts. Only saw a few fishing boats. A fair amount of commercial traffic. Two of the tugs with tows called us up on the VHF to confirm passing.
Nangka: the reef sticks out further than you think as you approach. There are two small moorings on the inside that can have 3 or 4 fishing boats on them in the daytime, as they wait to night fish. Everywhere behind the reef is deep. We anchored in 80 feet at 02*29.473S 108*32.121E The bottom was a surprising good holding mix of sand/mud/shells.
To Belitung: No wind, a day motor. We went in and anchored in the B anchorage from the Scott guide. The winds pick up more easterly in the afternoon and make the A,B and C anchorages not very friendly. The E anchorage is better, but it can still get windy enough to have a wet dinghy ride. Good and safe dinghy landing at Ringos restaurant (ask someone in the anchorage to point it out). He can deliver fuel and arrange a driver and car to town, which is 45 minutes away. Good fresh veggie market in town and that's where you do any Immigration or Customs business.
02*33.153S 107*39.723E in 18feet sand.