Currently in beta 3C, notable locations are split into ranks from 1 (lowest) to at least 4 (haven't got beyond that). It appears that the goodies received from the notable locations are not graded in the same way:
Example: level one location gave me 100 Gildar. But a level 3 loactiaon gave me 25 Gildar.
I would suggest that given that higher level locations require research to be completed in Adventuring, that the higher level locations should always give more than the previous level, either more of the same, or the same plus some other goodies.
Example: level one location gives 100 Gildar. The level 3 version gives 100 Gildar plus 20 Materials plus 5 Metal.
On how much the first level locations shuold give, 100 Gildar is probably overpowered for early game compared to the cost of things. 100 Gildar buys a whole new city, or 2 resource tile buildings.
I suggest that first level locations give 25 Gildar or equivalent. Subsequent level locations shuold give: Resource = Equivalent(25N Guildar) where N is the level of notable location.