Highly repetitive DNA is seen in -
Repetitive sequences in DNA are :-

Highly repetitive sequences :- Clustered in centroineres and telomeres.
Moderately repetitive sequences :- LINEs and SINEs.

Microsatellite repeat sequences may be both highly repetitive sequences (grouped tandem array) and moderately repetitive sequences (dispersed).
Microsatelite DNA
Telomere
Centromere
All of these