{
  "id": "2s31-vena",
  "name": "2S31 Vena",
  "aliases": [],
  "domain": "land",
  "country": "RUS",
  "category": "Amphibious 120mm self-propelled mortar",
  "status": null,
  "fielded": 2010,
  "operators": [
    "AZE",
    "RUS",
    "VEN"
  ],
  "prolif_count": 4,
  "summary": "The 2S31 Vena is a self-propelled gun/mortar of Russian origin. It was developed as a more capable and more high-end alternative to the wheeled 2S23 Nona.",
  "specs": [
    {
      "k": "",
      "label": "Chassis",
      "section": "mobility",
      "v": "BMP-3",
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "crew",
      "v": 4,
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "combat_weight_t",
      "v": 19.5,
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "engine_name",
      "v": "1 x UTD-29M",
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "engine_hp",
      "v": 500,
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Suspension",
      "section": "mobility",
      "v": "Hydropneumatic shock absorbers",
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "road_range_km",
      "v": 600,
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "speed_road_kmh",
      "v": 70,
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "speed_swim_kmh",
      "v": 9,
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Fording",
      "section": "mobility",
      "v": "Amphibious, 2 Waterjets",
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Computerized FCS",
      "section": "firecontrol",
      "v": "Yes, \"Vena\" features modern fire control system.",
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Laser Detector",
      "section": "firecontrol",
      "v": "Yes, A laser detector is mounted on the low part of the turret front, either side of the 120 mm 2A80 ordnance and on either side of the turret roof at the rear which is used in conjunction with the smoke grenade system.",
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Hull Armor",
      "section": "protection",
      "v": "The hull of the 2S31 is built from aluminum (possibly the ABT-102 alloy from Nii Stali), which is then covered with bolt-on hardened steel armor. Without the steel, the aluminum protects against small arms fire and shell splinters, and the ",
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Turret Armor",
      "section": "protection",
      "v": "The steel armor protects the crew from small arms fire and shells splinters.",
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Applique Armor",
      "section": "protection",
      "v": "The vehicles can be fitted with bar armour to provide statistical protection against cumulative projectiles or RPG-7 type weapons. There is an additional armour kit available that appears to add spaced modules to the sides of the hull. It i",
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "NBC Protection",
      "section": "protection",
      "v": "Yes",
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "",
      "label": "Smoke Equipment",
      "section": "protection",
      "v": "Yes",
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "armament",
      "label": "Secondary armament",
      "v": "1 x PKMT 7.62mm General-Purpose Machine Gun",
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium"
    },
    {
      "k": "range_max_km",
      "v": 13,
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium",
      "label": "Maximum firing range",
      "note": "Longest-range ammunition listed"
    }
  ],
  "payloads": [
    {
      "name": "HE FRAG",
      "role": "120 mm ammunition",
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium",
      "caps": {
        "Armor penetration": "120-mm 2A80 rifled semi-automatic gun firing mortar bombs, conventional armor-piercing and artillery rounds and Kitolov-2M laser-guided proj"
      },
      "range_km": 13,
      "qty": "70 Rounds"
    },
    {
      "name": "Mortar Bomb",
      "role": "120 mm ammunition",
      "src": [
        "weg-2s31-vena"
      ],
      "conf": "medium",
      "caps": {},
      "range_km": 7.2,
      "qty": "70 Rounds"
    }
  ],
  "variants": [
    {
      "name": "1B172-2 command vehicle",
      "text": "The 1B172-2 unified artillery command-observation post/command-and-staff vehicle is based on the same hull as the 2S31. It is fitted with additional communications equipment and a mast-mounted sensor package.",
      "src": [
        "weg-2s31-vena"
      ]
    },
    {
      "name": "120-mm 2S34 Khosta",
      "text": "This is an upgraded 2S1 self-propelled howitzer fitted with the complete 120-mm 2A80 gun from the 2S31, which is fitted with a muzzle brake. See separate record for more information.",
      "src": [
        "weg-2s31-vena"
      ]
    }
  ],
  "art": "sph",
  "image": {
    "file": "2s31-vena.jpg",
    "thumb": "2s31-vena-thumb.jpg",
    "credit": "Nockson",
    "license": "CC BY-SA 3.0",
    "url": "https://commons.wikimedia.org/wiki/File:2S31_Vena_at_%22Engineering_Technologies_2010%22_forum_(2).jpg",
    "title": "File:2S31 Vena at \"Engineering Technologies 2010\" forum (2).jpg"
  },
  "verified": null,
  "changelog": [
    {
      "date": "2026-10-10",
      "change": "Entry created from the Worldwide Equipment Guide (ODIN), bulk import"
    },
    {
      "date": "2026-10-10",
      "change": "Added photo (CC BY-SA 3.0)"
    }
  ],
  "url": "https://www.defensepedia.com/systems/2s31-vena.html",
  "sources": {
    "weg-2s31-vena": {
      "title": "2S31 Vena Russian Amphibious 120mm Self-Propelled Mortar",
      "publisher": "U.S. Army TRADOC G-2 Worldwide Equipment Guide (ODIN)",
      "url": "https://odin.t2com.army.mil/WEG/Asset/2S31_Vena_Russian_Amphibious_120mm_Self-Propelled_Mortar",
      "published": "2026-03-20",
      "tier": 1,
      "checked": "2026-10-10"
    }
  }
}