What's the most dangerous/populated location for a base

[Kannon]

Something that would let me ♥♥♥♥ off the maximum number of people in the shortest time possible.
Ideally - HN, Sheks and UC at the same time.
If that's impossible 1-2 major factions + lots raiders to shoot at.

Right now i'm eyeing Dreg's bit near Stack as that seem like it will give me an acess to foggers, cannibals and HN but there's surely a better option

[Pyrrhus]

Bast but there's no zone that have 3 major factions within. Just UC and HN plus cannibals and some other factions. Sheks can be found outside of their zone only after town overridden up to Blister's Hill.

[Radiosity]

HN and Shek? Just settle somewhere around the border zone. In Hub area, talk to the HN preacher and mention Narko (or talk using a skeleton) to provoke an assault. Or a bit south near Squin and wait for the tribute guys, tell them to sod off.

You're perfectly located dead centre and will get raids from both, plus you can easily travel south or northeast and honk off the UC as well if you like.

However, the area itself is pretty safe, so... yeah, up to you. If you want insanity, just crank up the squad sizes and the frequency of base raids and you'll be getting them every couple of days from multiple factions.

Alternatively, try west in the direction of Fog Islands and Purple Sands. Plenty of screeching bandits, cannibals, berserkers, iron spiders, fog, and it's within distance for HN and Shek to assault you if you annoy them to that point.

You can also go grab Bugmaster for the extra raids that produces... but I'm not sure if you actively need to hand him to the Shek for those to trigger. If you do... well, just hand the bounty over and tell them you don't want the alliance, that should be enough since you still took Bugmaster down and the raids should therefore trigger.