They're dotted all around the city. Look for kind of fiery looking portals on the streets and in alleys and stuff.
Talk about accurate. That map is definitely missing a few abduction locations though. I was just going to come in here and say "they're pretty much everywhere"
theres usually a cluster of them located around the Diamond District PD around the areas that are popular for seasonal events and where heatwave spawns...
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I know this doesn't answer you question exactly but I normally do them in Metropolis. Southside of Historic district usually has a decent amount for me.
I think it's the one for Abductions since there are usually citizens being attacked/abducted by the cultists.
I've two complaints about their spawns. One: WHY are there no cultists on Arkham Island? You'd think to find dangerous religous nuts around an asylum, right? Two: South Gotham's SO big & empty, some there would give the area more life.