This is the 936th most frequent Chinese word.
境外
"Outside the country; abroad; overseas."
In this sentence, '境外' refers to places outside the national boundaries, indicating where the shopping occurs.
许多旅客选择在境外购物。
Many travelers choose to shop abroad.
'境外' in this instance denotes international locations where people travel to.
境外旅游逐渐成为一种流行的活动。
Traveling abroad is gradually becoming a popular activity.
Here, '境外' describes the origin of the funds as being from outside the country.