# 29 Locked Peak · 4,000–4,999 m · Isfahan 4413 m Dena دنا

# 54 Locked Protected area · Isfahan Dena Protected Area منطقه حفاظت شده دنا

# 07 Locked Cave · Isfahan Dengezlu Cave غار دنگزلو

# 49 Locked River · Sistan and Baluchestan Derāb درآب

# 65 Locked Spring · Chaharmahal and Bakhtiari Deyme Spring چشمه دیمه

# 50 Locked River · Khuzestan Dez دز

# 55 Locked Protected area · Khuzestan Dez Protected Area منطقه حفاظت شده دز

# 83 Locked Peak · 2,000–2,999 m · Isfahan 2935 m Dian دیان

# 56 Locked Protected area · Ilam Dinar Kuh Protected Area منطقه حفاظت شده دینارکوه

# 126 Locked Waterfall · Mazandaran Dinarsara Waterfall آبشار دینار سرا

# 576 Locked Peak · 3,000–3,999 m · Mazandaran 3476 m Dirdang دیردنگ

# 66 Locked Spring · Chaharmahal and Bakhtiari Dirijno دیریژنو (دروغ زن اب)

# 337 Locked Peak · 3,000–3,999 m · Mazandaran 3790 m Div Asiab دیو آسیاب

# 101 Locked Peak · 4,000–4,999 m · Mazandaran 4176 m Divchal دیوچال

# 685 Locked Peak · 3,000–3,999 m · Mazandaran 3354 m Divkhas دیوخاس

# 51 Locked River · Kurdistan Diyala River رود دیاله

# 52 Locked River · Alborz Dizan River رود دیزان

# 57 Locked Protected area · East Azerbaijan Dizmar Protected Area منطقه حفاظت شده دیزمار

# 21 Locked Forest · Protected woodland · East Azerbaijan Dizmar Protected Forest منطقه حفاظت‌شده دیزمار

# 53 Locked River · Razavi Khorasan Djarfrud ژرف رود

# 103 Locked Peak · 2,000–2,999 m · Isfahan 2342 m Do Shakh-e Mehrab دوشاخ محراب

# 54 Locked River · Mazandaran Do'aab دواب

# 67 Locked Spring · Isfahan Doctor Fish دکتر فیش

# 58 Locked Protected area · Mazandaran Dodangeh Wildlife Refuge پناهگاه حیات وحش دودانگه

# 105 Locked Peak · 4,000–4,999 m · Mazandaran 4167 m Dokal kamar دوکَل کَمَر

# 69 Locked Valley or canyon · Razavi Khorasan Dolatabad Valley دره دولت آباد

# 70 Locked Valley or canyon · Razavi Khorasan Dolatabad Valley دره کلات

# 131 Locked Waterfall · Fars Dom-e Asb Canyon Waterfall آبشار تنگ دم اسب

# 68 Locked Spring · Fars Dom-e Asb Spring چشمه دم اسب

# 876 Locked Peak · 3,000–3,999 m · Alborz 3200 m Domil دومیل

# 71 Locked Valley or canyon · Fars Domtang دم تنگ

# 16 Locked Island or coast · West Azerbaijan Donkey Island جزیره اشک

# 461 Locked Peak · 3,000–3,999 m · Mazandaran 3608 m Doona دونا

# 172 Locked Lake · Dam or reservoir · Razavi Khorasan Doosti Reservoir دریاچه سد دوستی - Dostluk suw howdany

# 55 Locked River · Golestan Doqchay دوُغ چای

# 216 Locked Peak · 3,000–3,999 m · Mazandaran 3970 m Dor ghar دُرغار

# 59 Locked Protected area · Razavi Khorasan Dorbadam Protected Area منطقه حفاظت شده دربادام

# 72 Locked Valley or canyon · Razavi Khorasan Dorbadam valley دره دُر بادام

# 353 Locked Peak · 2,000–2,999 m · Gilan 2714 m Dorfak درفک

# 17 Locked Island or coast · Hormozgan Double Sided Beach سهل دوطرفه

# 379 Locked Peak · 2,000–2,999 m · Isfahan 2688 m Dowtu دوتو

# 204 Locked Peak · 3,000–3,999 m · Chaharmahal and Bakhtiari 3995 m Dozardeh دوزرده

# 56 Locked River · Razavi Khorasan Drongar River رودخانه درونگر

# 50 Locked Waterfall · Gilan Dudvazan Waterfall آبشار دودوزن

# 568 Locked Peak · 3,000–3,999 m · Markazi 3505 m Dumir دومیر

# 58 Locked Peak · 4,000–4,999 m · Mazandaran 4289 m East Do Khaharan دوخواهران شرقی

# 146 Locked Peak · 4,000–4,999 m · Tehran 4072 m East Doberar دوبرار شرقی

# 236 Locked Peak · 3,000–3,999 m · Tehran 3935 m East Janeston جانستون شرقی

# 91 Locked Peak · 4,000–4,999 m · Mazandaran 4198 m East Narges نرگس شرقی

# 60 Locked Protected area · Kohgiluyeh and Boyer-Ahmad Eastern Dena Protected Area منطقه حفاظت شده دنا شرقی

# 61 Locked Protected area · Razavi Khorasan Eftekhari Protected Area منطقه حفاظت شده افتخاری

# 57 Locked River · Fars Eghlid River رودخانه اقلید

# 156 Locked Waterfall · East Azerbaijan Eish Abad عیش آباد

# 290 Locked Peak · 3,000–3,999 m · Mazandaran 3862 m Elerm الرم

# 340 Locked Peak · 3,000–3,999 m · Mazandaran 3782 m Enar انر

# 117 Locked Peak · 4,000–4,999 m · Mazandaran 4135 m Erim اریم

# 128 Locked Peak · 2,000–2,999 m · Yazd 2899 m Ernan ارنان

# 08 Locked Cave · Khuzestan Eshkaft-e Salman اشکفت سلمان

# 142 Locked Peak · 2,000–2,999 m · Isfahan 2288 m Eshkeneh اشکنه

# 69 Locked Spring · Mazandaran Eshketeh اشکته