an area where a lot of bombs have been hidden just below the ground or under water:
They realized they had wandered into a minefield.
a situation in which there are a lot of dangers and difficulties, and it is difficult to make the right decision:
Choosing the right school can be a bit of a minefield.
The new Administration has to pick its way through the minefield of legislation.
legal/financial/political etc minefield
The legalisation of cannabis is a political minefield.