Final answer:
The availability of resources such as timber has greatly influenced the development of cities.
Step-by-step explanation:
The natural feature that has most affected the continued development of a city is the availability of resources such as timber. In the example given, the availability of plentiful timber near Boston, Massachusetts played a significant role in the city's development. Timber was used for construction, fuel, and other purposes, which contributed to the growth and expansion of the city.
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