There is a confussion in the explenation. Should say masculin or starting with 'h'.

Hey, don't know what the confusion is about, it says underneath the first set of examples the rule.

Here is the rule to express in or to:

- You use en with feminine regions/states/counties (usually ending in -e)

- You use dans le with masculine regions/states/counties starting with a consonant or aspirated h.

- You use dans l' with masculine regions/states/counties starting with a vowel or mute h.