سَبْعَةَ أَشْوَاطٍ
Translation: Seven circuits.
Sabʿata is the numeral, while ashwāṭin is the genitive plural counted noun.
الْأَشْوَاطِ الثَّلَاثَةِ الْأُوَلِ
Translation: The first three circuits.
Al-thalāthati and al-uwali are dependent descriptive elements in the genitive phrase.