If you are searching ZJB for a lounge, the code itself is the first surprise: ZJB names Kuantan Port on Malaysia's east coast, a seaport, not an airport, so there is no terminal or gate behind it at all. What exists instead is the ground-side reality of a working port town, plus a real regional airport and a major hub not far away worth knowing about.
For travellers actually passing through Kuantan itself, the honest picture is basic waiting areas rather than anything resembling a business lounge: port terminal seating, nearby cafes, and coach or taxi stands for onward travel, the kind of ground-side setup you would expect at a working cargo and passenger port rather than an aviation gateway. There is no dedicated business lounge or airline-style space tied to the port itself.
Kuantan Airport (IATA: KUA), the actual airport serving this part of Pahang state, is a modest regional field handling domestic flights, and it does not carry a well-documented dedicated lounge. Travellers connecting through Kuantan by air should expect standard gate seating and terminal concessions, similar to many of Malaysia's smaller state-capital airports.
For a genuine lounge experience tied to this region, Kuala Lumpur International Airport (KLIA) is the real answer. Malaysia Airlines operates its Golden Lounge network there for elite frequent flyers and eligible premium-cabin passengers, and Plaza Premium, a brand that started in Malaysia, runs pay-in and Priority Pass lounges open to a wider range of travellers. If your journey routes through KLIA rather than staying local to Kuantan, that is where to plan your lounge stop, confirming current terminal location and access terms with either operator before you fly.
Most travellers who end up searching for ZJB are working out ground logistics around the port itself rather than looking for a place to relax before boarding. Treat the port stop as a functional waypoint, and save any lounge planning for whichever real airport, Kuantan or KLIA, actually anchors the flying portion of your trip.