ses

his, her, its, their, one's (when referring to a plural noun)

activités

plural of activité

sont

third-person plural present indicative of être

principalement

mainly, principally

situées

feminine plural of situé

autour

• Adv

  around

• Prep
• Noun

de

• Prep

  1. of (expresses belonging)
  2. of (used to express property or association)
  3. from (used to indicate origin)
  4. of (indicates an amount)
  5. used attributively, often translated into English as a compound word
  6. from (used to indicate the start of a time or range)
  7. used after certain verbs before an infinitive, often translated into English as a gerund or an infinitive
  8. by (indicates the amount of change)

• Article
• Noun

en

• Prep

  1. in (used to indicate space, also see usage notes)
  2. to (indicates direction towards certain very large locations, see usage notes)
  3. by (used to indicate means)
  4. as
  5. at (used to describe an ability)
  6. of, made of (used to describe composition)
  7. in (during the following time (used for months and years))
  8. while
  9. by, in (describing a way of getting something)
  10. in (used to describe color)
  11. in (used to describe feelings)
  12. in (as part of something)

• Pron