Where is PH908 most diverse in the world?

1. What does “most diverse” mean?
In Y-DNA genetics, diversity within a haplogroup means:
High SNP diversity → many different downstream branches.
Deep TMRCA → branches split further back in time.
Wide STR variance → more variation in short tandem repeats.
Populations with the highest diversity usually live near the area of origin or long-term continuity — because mutations accumulate locally over generations.
Global PH908 pattern
The PH908 branch is:
A South Slavic signature clade, especially within the Dinaric Alps zone.
A sub-branch of I2-Y3120, which itself is a major Slavic paternal lineage.
PH908 is mostly found in:
1. Western Serbia (Drina river valley, Zlatibor, Užice, Valjevo)
2. Eastern Bosnia & Herzegovina (Republika Srpska, Herzegovina, parts of Krajina)
3. Montenegro (north)
4. Present among Croats in Dalmatia/Lika, and Bosniaks in eastern Bosnia and Sandžak — but these groups generally show lower diversity because their PH908 is from older Serbian/Slavic clusters.
Who has the highest PH908 diversity — the facts
All reputable studies, YFull tree analysis, FTDNA Balkan projects, and projects like Poreklo.rs confirm:
The highest SNP and STR diversity is consistently in Serbian populations, especially western Serbia and eastern Bosnia.
In these areas, PH908 splits into multiple deeply divergent subclades, like:
Y18331
Y874
Y56203
Z16983+
Y5332
These lineages show local continuity, often linked to old medieval tribal structures.
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Does anyone outside the Balkans have comparable diversity?
Ukraine & Poland: I2a-Y3120 is common, but PH908 specifically is rare and shallow there — they mostly have other I2a subclades.
Russia & Belarus: Same — they have more Z280 (R1a) and other branches.
Diaspora: Serbian/Bosnian diaspora has PH908, but that’s just an extension of the Balkan lineages.
So: There is no evidence of significant PH908 diversity outside the Western Balkans.
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Where is the peak?
If you wanted to stand at the “epicenter” of PH908 diversity, it would be:
Drina river region (border of Serbia and Bosnia)
Hercegovina highlands
Northern Montenegro
In these zones, you see both many parallel branches and deep TMRCA, showing they didn’t just arrive recently but have evolved locally
Key takeaway
Who has the most diversity in PH908 worldwide?

Serbs — especially from western Serbia, eastern Bosnia & Herzegovina, and parts of northern Montenegro — have the greatest genetic depth and branching within PH908.
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Sources to verify
YFull I2-Y3120 tree
FTDNA Balkan Project results
Poreklo.rs DNK projects (hundreds of tested lineages, many fully SNP-tested)
Peer-reviewed research: e.g., Peričić et al. (2005), Battaglia et al. (2009), Kushniarevich et al. (2015) — show strong continuity of I2a-Dinaric lineages in this zone.
Dakle, niko živ ne spori da je PH908 kod Srba apsolutno najraznovrsnija i najdublja.