Gongoni Malindi Salt Company: Where Exactly is it?

Well, the Gongoni salt company is within Gongoni area in Magarini constituency. The biggest town around the area is Malindi, and if you want to get to Gongoni, you usually have to pass through Malindi (hence why it is referred to as a Malindi company though it is actually in Magarini constituency).

So if you are coming from Mombasa, and going to the Gongoni salt company, you take the Mombasa Malindi highway, pass through Kilifi, and go past Malindi itself [on the Malindi-Lamu road], cross Sabaki river (by the way, Sabaki river is what begins as Athiriver upcountry) and travel for a few more minutes to arrive at Gongoni.

If you wish to travel to Gongoni by public means (from Mombasa) what you need to do is first go to Buxton area of Mombasa, take a Malindi bound matatu or bus there, then travel all the way to Malindi. At the Malindi bus station (Malindi stage mpya), you can find one of the matatus or buses that ply the Gongoni Marereni route, and then request to be dropped at Gongoni [it is a major stage on that route, and some matatus actually terminate at Gongoni].

The Malindi Gongoni salt company is a huge imposing structure which can be seen from afar. I actually think there are several salt companies operating on the stretch between Gongoni and Marereni -- so don't expect to see just one factory. Adjacent to the company are salt farms, with their characteristic smell.
Looking at the trucks that come to pick salt from the plant, it is clear that this is an international establishment that serves not only the Kenyan market, but also the Tanzanian (or at least part of the Tanzanian) market, the Rwandan market, the Burundi market, the Congolese market, perhaps the Ugandan market… and so on. There are several guest houses you can sleep in while at Gongoni, but if you want to stay at a classy hotel, you would probably have to commute from Malindi.